#!/bin/sh
#(c) Copyright Barry Kauler Nov. 2010. License: GPL v3 /usr/share/doc/legal.
#called from /lib/udev/usb_modeswitch, which in turn is called by udev rule when a 3G modem inserted.
#101208 rewrite, simpler.
#101209 switch has occurred, but sometimes (my ZTE K3571-Z modem) usbserial.ko fails to attach to usb interface.
#110914 think possible this script gets called almost simultaneously more than once.
#110914 create /dev/gsmmodem symlink if usb-modeswitch fails to do it.
#120109 usb_modeswitch 1.2.1 different success message.
#120109 /usr/sbin/usb_modeswitch_special_status now just comes here (usb modems that do not need switch).
#120202 rodin.s: internationalized.
#130326 note: DEVICE variable no longer in 3.5+ kernel, as /proc/bus/usb removed.

export TEXTDOMAIN=usb_modeswitch_status
export OUTPUT_CHARSET=UTF-8
export LANG="`cat /etc/profile|grep '^LANG='| cut -d '=' -f2`"

#110914 think possible this script gets called almost simultaneously more than once...
#start lock region#
touch /tmp/usb_modeswitch_status_lockregion_${$}_
SLEEPU1=`echo -n ${$} | rev`0 #ex: pid 3124 becomes 4213, more variability for sleep.
SLEEPU2=${$}0
for ASLEEP in $SLEEPU1 $SLEEPU2
do
 SIMULT="`ls -1 /tmp/usb_modeswitch_status_lockregion_*_`"
 #random sleep means that this process will kill the others before they can kill this one...
 usleep ${ASLEEP} #ex: 42130 is 42 milliseconds.
 if [ `echo "$SIMULT" | wc -l` -gt 1 ];then
  for ONEPID in `ls -1 /tmp/usb_modeswitch_status_lockregion_*_ | rev | cut -f 2 -d '_' | rev | tr '\n' ' '`
  do
   [ $ONEPID -eq ${$} ] && continue
   [ -f /tmp/usb_modeswitch_status_lockregion_${ONEPID}_ ] && kill $ONEPID #other process within lock region.
   [ $? -eq 0 ] && rm -f /tmp/usb_modeswitch_status_lockregion_${ONEPID}_
  done
 fi
done
rm -f /tmp/usb_modeswitch_status_lockregion_${$}_
#end lock region#

rm -f /tmp/usb_modeswitch_status_flag_success 2>/dev/null

DISPLAY=":0" /usr/lib/gtkdialog/box_splash -placement center -close never -bg yellow -fontsize large -text "$(gettext '3G USB modem inserted, please wait, configuring ...')" &
yPID=$!

BRKCNT=0
while [ $BRKCNT -lt 30 ];do
 sleep 1
 LOGS="`cat /var/log/usb_modeswitch_*`"
 [ "`echo "$LOGS" | grep 'Mode switch succeeded'`" ] && break
 [ "`echo "$LOGS" | grep 'Mode switching was successful'`" ] && break #120109 usb_modeswitch 1.2.1 different success message.
 BRKCNT=$(($BRKCNT+1))
done

if [ $BRKCNT -lt 30 ];then
 #101209 switch has occurred, but sometimes (my ZTE K3571-Z modem) usbserial.ko fails to attach to usb interface...
 sleep 2
 if [ "`lsmod | grep '^usbserial '`" != "" ];then
  if ! ls /dev/ttyUSB* 2>/dev/null;then
   sleep 2
   if ! ls /dev/ttyUSB* 2>/dev/null;then
    VENDOR="`echo -n "$PRODUCT" | cut -f 1 -d '/'`"
    #101210 keep this simple, only one usb modem plugged in, claiming usbserial.ko...
    modREGEX="v${VENDOR}p[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]"
    CHIPNO="`cat /sys/bus/usb/devices/*/modalias | grep -i -o "$modREGEX" | cut -f 2 -d 'p' | tail -n 1`"
    UPMOD="`lsmod | grep '^usbserial ' | tr -s ' ' | cut -f 4 -d ' ' | cut -f 1 -d ','`"
    if [ -e /sys/bus/usb-serial/drivers/${UPMOD}1/new_id ];then
     echo "$VENDOR $CHIPNO" > /sys/bus/usb-serial/drivers/${UPMOD}1/new_id
     sleep 2
    fi
    if ! ls /dev/ttyUSB* 2>/dev/null;then
     rmmod $UPMOD
     rmmod usbserial
     modprobe usbserial vendor=0x${VENDOR} product=0x${CHIPNO}
     modprobe $UPMOD
    fi
   fi
  fi
  
  #110914 this works on my new laptop...
   if [ ! -h /dev/gsmmodem  ];then #supposed to be auto-created, but what if it fails.
    sleep 5
    if [ ! -h /dev/gsmmodem  ];then
     #looks for ep_8[0-9]/type with "Interrupt" in it then follows up path looking for a "ttyUSB[0-9]" dir...
     GSMMODEM="`find /sys/devices -regex '/sys/devices/.*/ep_[8][0-9]/type' | grep '/usb[0-9]' | xargs grep 'Interrupt' | sed -e 's%/ep_[8].*%%' | xargs -I ABCDEF find ABCDEF -maxdepth 1 -name 'ttyUSB*' | rev | cut -f 1 -d '/' | rev | sort -u | head -n 1`"
     [ "$GSMMODEM" ] && ln -s ${GSMMODEM} /dev/gsmmodem
    fi
   fi
 fi
 kill $yPID
 DISPLAY=":0" /usr/lib/gtkdialog/box_splash -placement center -close never -timeout 12 -bg green -fontsize large -text "$(gettext '3G USB modem now ready for use')" &
 touch /tmp/usb_modeswitch_status_flag_success
else
 #do not display an error msg. in case no modeswitch was required?
 echo
fi

mkdir /tmp/usb_modeswitch${$}
mv -f /var/log/usb_modeswitch_* /tmp/usb_modeswitch${$}/
sleep 50 #just in case /lib/udev/usb_modeswitch tries to rerun this script.
kill $yPID
###END###
